Air Source Heat Pump Water Heater
18
prevent it from loosening. The guide pipe must be installed at the non-frost
environment and connected to the floor drain adown and must not be folded to
prevent blocking.
If the safety check valve is damaged, you should maintain or replace the same
type or the same parameter. The safety check valve
’s parameter should meet the
following table requirement.
Table 7-3 safety check valve parameter
Name
Value of relief pressure
Safety check valve
0.7MPa
（
4
）
Installing the outfall pipe
As shown in Figure 7-5, remove the outfall plug. Then, use an outfall pipe to
connect the outfall to the floor drain, and ensure that the outfall pipe and the joint of
the floor drain are lower than the bottom of the water tank. Otherwise, the water
cannot be drained. In addition, the cut-off valve must be installed in the position
at which the user can conveniently operate it.
Cut-off valve A
Hot water output
Safety check
valve
Filter
Cut-off valve B
Tap water
Floor drain
Figure 7-5 Safety check valve and outfall pipe installation
Caution
：
In order to ensure water safety, both the water inlet and outlet must be
connected to a PPR pipe for each to insulate electricity. The length L of the PPR
pipe is calculated by the following formula: L
≥ 70 x R
2
, of which L is the length of the
PPR pipe (unit: cm), and R is the inner radius (unit: cm) of the PPR pipe. In addition,
